David is trying to conduct the Time-phased budget and cash flow analysis for the first four activities of the project. Assuming 30 working days per month, and the duration of each activity and labor budget is shown below: ID Description Predecessor Duration Budget A Prepare Site None 20 $4,000 B Pour Foundation A 35 $15,610 C Erect Frame B 45 $45,000 D Roof B 65 $70,200 (1) Allocate the labor proportionally to the time worked each month. Please calculate the cumulative budget at the end of each month from month 1 to month 4. The cumulative budget of M1 is [Fill in the blank] ; M2 is [Fill in the blank] ; M3 is [Fill in the blank] ; M4 is [Fill in the blank] .   (2) With an initial payment of $20,000, Karim and Emanuel made the payment plan at the end of every month to David as follows Month 1: $10,000 Month 2: $100,000 Month 3: $0 Month 4: $10,000   Please calculate the cash flow balance for each month. Cash flow balance at the end of Month 1: [Fill in the blank] Cash flow balance at the end of Month 2: [Fill in the blank] Cash flow balance at the end of Month 3: [Fill in the blank] Cash flow balance at the end of Month 4: [Fill in the blank] 多项填空题